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• The period of time during which a forecast or warning, until it is updated or superseded by a new forecast issuance, is in effect.

  NOAA National Weather Service - Cite This Source - This Definition
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  Cite Definition for Valid Time

  American Psychological Association (APA)

  Valid Time. (n.d.). National Weather Service Glossary. Retrieved June 8, 2023, from website: http://www.expertglossary.com/definition/valid-time.

  Chicago Manual of Style (CMS)

  Valid Time. www.weather.gov. National Weather Service Glossary. NOAA National Weather Service. http://www.expertglossary.com/definition/valid-time (accessed: June 8, 2023).

  Modern Language Association (MLA)

  "Valid Time." National Weather Service Glossary. NOAA National Weather Service. 8 June. 2023 http://www.expertglossary.com/definition/valid-time.

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